Snowberry

It sure looked right to me, but I was way off. The tiny flowers I saw in the bog are not, apparently, alpine azalea, but instead are creeping snowberry. The picture I saw in the Audubon guide looked just like my blossoms, but the USDA site and all the other sites say alpine azalea is more a shrub than creeping, and snowberry is definitely creeping. It has berries, which I'll have to watch for later on, but I vaguely remember.